T90 adopts heat-insulating profile, and the shell is designed to be streamlined. It is suitable for plastic steel, aluminum alloy, and wooden doors and windows. The interior material is processed into a mosquito net shape. At the same time, a dust-proof net can be added to prevent insects and dust. The inner net is easy to take by hand It is installed under the glass for easy cleaning and maintenance. The flap has four seals to make it have excellent waterproof and windproof performance.